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| Peaktech 4250 AC/DC current clamp teardown and repair. |
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| The Soulman:
I've owned this clamp now for a while but never was satisfied with the low current readings there was to much noise and drift to be useful. After reading here: https://www.eevblog.com/forum/testgear/hantek-cc-65-acdc-current-probe-teardown-and-testing/ about insufficient decoupling in the Hantek CC-65 I decided to open up my (similair but not exactly the same) Peaktech. And discovered there weren't any electrolytic capacitors fitted at all! :-// Fitted some 33uf 35V caps because that is what I had and it functions much better now. :-+ Anyone has an idea about who could be the OEM of these clamps and what each of those trim pots does? |
| The Soulman:
More pics.. |
| The Soulman:
Caps fitted.. |
| schmitt trigger:
I have that exact same probe! Between today and tomorrow I will open it up and see if it also has the same capacitors missing. To your question, I see a pair of probable answers: -cost savings. When a company sells these so inexpensively, every cent counts! -manufacturing error. The board is a mixed mode SMT/TH component assembly. Perhaps the TH components are hand fitted, and they forgot installing the electrolytics. |
| The Soulman:
--- Quote from: schmitt trigger on January 30, 2018, 05:08:40 pm ---I have that exact same probe! Between today and tomorrow I will open it up and see if it also has the same capacitors missing. To your question, I see a pair of probable answers: -cost savings. When a company sells these so inexpensively, every cent counts! -manufacturing error. The board is a mixed mode SMT/TH component assembly. Perhaps the TH components are hand fitted, and they forgot installing the electrolytics. --- End quote --- Cool, yeah my idea is that the guy or gall responsible for fitting them came in late that day or had a long lunch break... |
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